/// <summary>
/// Populates listview with machines connected to the LAN
/// </summary>
/// <param name="view"></param>
/// <param name="interfacefriendlyname"></param>
public static void GetAllClients(IView view, string interfacefriendlyname)
{
DebugOutputClass.Print(view, "Refresh client list");
#region initialization
view.MainForm.Invoke(new Action(() => view.ToolStripStatusScan.Text = "Please wait..."));
view.MainForm.Invoke(new Action(() => view.ToolStripProgressBarScan.Value = 0));
if (capturedevice != null)
{
try
{
capturedevice.StopCapture(); //stop previous capture
capturedevice.Close(); //close previous instances
}
catch (PcapException ex)
{
DebugOutputClass.Print(view, "Exception at GetAllClients while trying to capturedevice.StopCapture() or capturedevice.Close() [" + ex.Message + "]");
}
}
clientlist = new Dictionary <IPAddress, PhysicalAddress>(); //this is preventing redundant entries into listview and for counting total clients
view.ListView1.Items.Clear();
#endregion
CaptureDeviceList capturedevicelist = CaptureDeviceList.Instance;
capturedevicelist.Refresh(); //crucial for reflection of any network changes
capturedevice = (from devicex in capturedevicelist where ((SharpPcap.WinPcap.WinPcapDevice)devicex).Interface.FriendlyName == interfacefriendlyname select devicex).ToList()[0];
capturedevice.Open(DeviceMode.Promiscuous, 1000); //open device with 1000ms timeout
IPAddress myipaddress = ((SharpPcap.WinPcap.WinPcapDevice)capturedevice).Addresses[1].Addr.ipAddress; //possible critical point : Addresses[1] in hardcoding the index for obtaining ipv4 address
#region Sending ARP requests to probe for all possible IP addresses on LAN
new Thread(() =>
{
try
{
for (int ipindex = 1; ipindex <= 255; ipindex++)
{
ARPPacket arprequestpacket = new ARPPacket(ARPOperation.Request, PhysicalAddress.Parse("00-00-00-00-00-00"), IPAddress.Parse(GetRootIp(myipaddress) + ipindex), capturedevice.MacAddress, myipaddress);
EthernetPacket ethernetpacket = new EthernetPacket(capturedevice.MacAddress, PhysicalAddress.Parse("FF-FF-FF-FF-FF-FF"), EthernetPacketType.Arp);
ethernetpacket.PayloadPacket = arprequestpacket;
capturedevice.SendPacket(ethernetpacket);
}
}
catch (Exception ex)
{
DebugOutputClass.Print(view, "Exception at GetClientList.GetAllClients() inside new Thread(()=>{}) while sending packets probably because old thread was still running while capturedevice was closed due to subsequent refresh [" + ex.Message + "]");
}
}).Start();
#endregion
#region Retrieving ARP packets floating around and finding out the senders' IP and MACs
capturedevice.Filter = "arp";
RawCapture rawcapture = null;
long scanduration = 5000;
new Thread(() =>
{
try
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
while ((rawcapture = capturedevice.GetNextPacket()) != null && stopwatch.ElapsedMilliseconds <= scanduration)
{
Packet packet = Packet.ParsePacket(rawcapture.LinkLayerType, rawcapture.Data);
ARPPacket arppacket = (ARPPacket)packet.Extract(typeof(ARPPacket));
if (!clientlist.ContainsKey(arppacket.SenderProtocolAddress) && arppacket.SenderProtocolAddress.ToString() != "0.0.0.0" && areCompatibleIPs(arppacket.SenderProtocolAddress, myipaddress))
{
clientlist.Add(arppacket.SenderProtocolAddress, arppacket.SenderHardwareAddress);
view.ListView1.Invoke(new Action(() =>
{
view.ListView1.Items.Add(new ListViewItem(new string[] { clientlist.Count.ToString(), arppacket.SenderProtocolAddress.ToString(), GetMACString(arppacket.SenderHardwareAddress), "On", ApplicationSettingsClass.GetSavedClientNameFromMAC(GetMACString(arppacket.SenderHardwareAddress)) }));
}));
//Debug.Print("{0} @ {1}", arppacket.SenderProtocolAddress, arppacket.SenderHardwareAddress);
}
int percentageprogress = (int)((float)stopwatch.ElapsedMilliseconds / scanduration * 100);
view.MainForm.Invoke(new Action(() => view.ToolStripStatusScan.Text = "Scanning " + percentageprogress + "%"));
view.MainForm.Invoke(new Action(() => view.ToolStripProgressBarScan.Value = percentageprogress));
//Debug.Print(packet.ToString() + "\n");
}
stopwatch.Stop();
view.MainForm.Invoke(new Action(() => view.ToolStripStatusScan.Text = clientlist.Count.ToString() + " device(s) found"));
view.MainForm.Invoke(new Action(() => view.ToolStripProgressBarScan.Value = 100));
BackgroundScanStart(view, interfacefriendlyname); //start passive monitoring
}
catch (PcapException ex)
{
DebugOutputClass.Print(view, "PcapException @ GetClientList.GetAllClients() @ new Thread(()=>{}) while retrieving packets [" + ex.Message + "]");
view.MainForm.Invoke(new Action(() => view.ToolStripStatusScan.Text = "Refresh for scan"));
view.MainForm.Invoke(new Action(() => view.ToolStripProgressBarScan.Value = 0));
}
catch (Exception ex)
{
DebugOutputClass.Print(view, ex.Message);
}
}).Start();
#endregion
}
/// <summary>
/// Actively monitor ARP packets for signs of new clients after GetAllClients active scan is done
/// </summary>
public static void BackgroundScanStart(IView view, string interfacefriendlyname)
{
try
{
IPAddress myipaddress = ((SharpPcap.WinPcap.WinPcapDevice)capturedevice).Addresses[1].Addr.ipAddress; //possible critical point : Addresses[1] in hardcoding the index for obtaining ipv4 address
#region Sending ARP requests to probe for all possible IP addresses on LAN
new Thread(() =>
{
try
{
while (capturedevice != null)
{
for (int ipindex = 1; ipindex <= 255; ipindex++)
{
ARPPacket arprequestpacket = new ARPPacket(ARPOperation.Request, PhysicalAddress.Parse("00-00-00-00-00-00"), IPAddress.Parse(GetRootIp(myipaddress) + ipindex), capturedevice.MacAddress, myipaddress);
EthernetPacket ethernetpacket = new EthernetPacket(capturedevice.MacAddress, PhysicalAddress.Parse("FF-FF-FF-FF-FF-FF"), EthernetPacketType.Arp);
ethernetpacket.PayloadPacket = arprequestpacket;
capturedevice.SendPacket(ethernetpacket);
}
}
}
catch (PcapException ex)
{
DebugOutputClass.Print(view, "PcapException @ GetClientList.BackgroundScanStart() probably due to capturedevice being closed by refreshing or by exiting application [" + ex.Message + "]");
}
catch (Exception ex)
{
DebugOutputClass.Print(view, "Exception at GetClientList.BackgroundScanStart() inside new Thread(()=>{}) while sending packets [" + ex.Message + "]");
}
}).Start();
#endregion
#region Assign OnPacketArrival event handler and start capturing
capturedevice.OnPacketArrival += (object sender, CaptureEventArgs e) =>
{
Packet packet = Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
ARPPacket arppacket = (ARPPacket)packet.Extract(typeof(ARPPacket));
if (!clientlist.ContainsKey(arppacket.SenderProtocolAddress) && arppacket.SenderProtocolAddress.ToString() != "0.0.0.0" && areCompatibleIPs(arppacket.SenderProtocolAddress, myipaddress))
{
DebugOutputClass.Print(view, "Added " + arppacket.SenderProtocolAddress.ToString() + " @ " + GetMACString(arppacket.SenderHardwareAddress) + " from background scan!");
clientlist.Add(arppacket.SenderProtocolAddress, arppacket.SenderHardwareAddress);
view.ListView1.Invoke(new Action(() => view.ListView1.Items.Add(new ListViewItem(new string[] { (clientlist.Count).ToString(), arppacket.SenderProtocolAddress.ToString(), GetMACString(arppacket.SenderHardwareAddress), "On", ApplicationSettingsClass.GetSavedClientNameFromMAC(GetMACString(arppacket.SenderHardwareAddress)) }))));
view.MainForm.Invoke(new Action(() => view.ToolStripStatusScan.Text = clientlist.Count + " device(s) found"));
}
};
capturedevice.StartCapture();
#endregion
}
catch (Exception ex)
{
DebugOutputClass.Print(view, "Exception at GetClientList.BackgroundScanStart() [" + ex.Message + "]");
}
}